Single crystal optical fiber cladding and preparation method thereof

A mutual diffusion gradient layer is formed in the single crystal optical fiber cladding through a secondary taper collapse process, which solves the problems of weak interface bonding and thermal stress concentration, and realizes efficient beam transmission and laser output. It is suitable for high-power lasers and single crystal optical fiber sensors in extreme environments.

CN120703901AActive Publication Date: 2025-09-26NAT UNIV OF DEFENSE TECH
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Patent Information

Application Number
CN202511212585.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-28
Publication Date
2025-09-26
Estimated Expiration
2045-08-28

AI Technical Summary

Technical Problem

Existing single-crystal optical fiber cladding technology has problems such as weak interface bonding, insufficient element diffusion, thermal stress concentration and poor material universality, resulting in high scattering loss, poor mechanical properties and insufficient thermal stability.

Method used

A secondary tapered collapse process is used to react the fluorine-doped quartz glass tube with the single crystal fiber core at high temperature to form a uniform interdiffusion gradient layer, achieve deep element interdiffusion and refractive index control, and form a three-layer gradient structure of Yb:YAG fiber core, interdiffusion gradient layer, and fluorine-doped quartz cladding.

Benefits of technology

It significantly improves the interface bonding quality, reduces scattering loss, enhances mechanical properties and thermal stability, and improves beam quality and laser efficiency, making it suitable for high-power lasers and single-crystal fiber sensors in extreme environments.

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Abstract

Aiming at the common bottleneck problems of weak interface bonding, insufficient element diffusion, concentrated thermal stress, poor material universality and the like existing in the current preparation process of the single-crystal optical fiber cladding, the invention aims to provide the single-crystal optical fiber cladding and the preparation method of the single-crystal optical fiber cladding. Atomic-scale tight attachment of the single crystal fiber core and the fluorine-doped quartz glass tube is achieved, element gradient diffusion transition layers with different thicknesses can be formed by adjusting the collapse temperature and the collapse speed, deep element mutual diffusion is achieved, then refractive index mutation is smoothed, and the problems that a single crystal fiber cladding is prone to stripping, poor in mechanical performance and the like are solved. And a universal cladding solution is provided for a high-power single-crystal fiber laser, a single-crystal fiber sensor in an extreme environment and the like.
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